Using dimensional analysis convert 5 km to centimeters.

5km = 500,000cm

Explanation:

5km     1000m      100cm

             1 km            1m

(The underline represents division)

Step 1: Multiply all the number on the top row including the 5.   5 x 1000 x 100

= 500,000

Step 2: Divide by the bottom row.     500,000 / 1 = 500,000 and then 500,000 / 1 = 500,000

Final 500,000cm

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )